Re: [Xen-users] Centos 5.2 using LVM -> DRBD 0.82 -> Xen Problems

[Antibozo <xen-users@xxxxxxxxxxxx>]

On 2008-08-05 14:55, Robert Dunkley wrote:
> I'm trying to get Xen to use a native DRBD device but it seems it will 
> not create the virtual machine. It does not seem to like the DRBD device 
> type, any ideas on what might be wrong?
> I’m pretty sure my xen config file is OK and the DRBD device looks fine too.
You might want to read the messages I've posted here recently with the 
subject "drbd 8 primary/primary and xen migration on RHEL 5".
The block-drbd script provided by drbd (which enables the "drbd:" syntax 
in xen config files) does not work, at least not on HVM vms (I haven't 
tested PVMs). By the time the script is executed, qemu-dm is already 
running and has already bailed on the device.
You can try using my qemu-dm wrapper script found at this URL:

http://www.antibozo.net/xen/qemu-dm.drbd

Save the wrapper script as /usr/lib64/xen/bin/qemu-dm.drbd, and modify 
the "device_model" line in your xen config file to point to the wrapper 
script.
Alter the disk line to use "phy:/dev/drbd0" instead of using the 
"drbd:drbd0" syntax. Make sure drbd0 is in secondary state *on both 
peers* before you start the vm. The script logs to the daemon facility, 
so watch your /var/log/messages.
Let me know how it goes.

--
Jefferson Ogata : Internetworker, Antibozo

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